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(No Model.) 3 Sheets-Sheet I A. P. G. ROLLET, Deo'd.

P. MAURO, Administrator. APPARATUS FOR THE PURIFICATION OF CAST IRON.

No. 491,508. Patented Feb. 7, 1893.

Wiinessss. I Inventor (No Model.) 3 Sheets-Sheet 2. A. P. G. ROLLET,Deod.

P. MAURO, Administrator. APPARATUS FOR THE PURIFICATION OF CAST IRON.

No. 491,508. Patent d Feb. 7, 1893.

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(No Model.) 3 Sheets-Sheet 3.

A. P. G. ROLVLETV, Deod.

P. MAURO, Administrator. APPARATUS FOR'THE PURIFICATION OF CAST IRON.

No. 491,508. Patented Feb. '7', 1893.

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arr 11 I 132N Z L WITNESSES INVENTOR UNTTED STATES PATENT OFFICE.

MAURO, OF "WASHINGTON, DISTRICT OF COLUMBIA, ADMINISTRATOR OF SAIDROLLET, DECEASED.

APPARATUS FOR THE PURIFICATION OF CAST-IRON.

SPECIFICATION forming part of Letters Patent No. 491,508, dated February7, 1893.

Application filed August 28. 1889. Serial No. 322,199- (No model.)Patented in France May 10, 1884; No. 162,003 in England October28,1884,No. 14,264, and in Germany May 20, 1885, No. 33,386.

To all whom it may concern:

Beit known that I, ANTOINE PIERRE GUIL- LAUME ROLLET, a citizen ofFrance, residing at St. Etienne, (Loire,) France, have invented certainnew and useful Improvements in Apparatus for the Purification ofCast-Iron, (for which I have received Letters Patent in France, No.162,003, dated May 10, 1884; in England, No. 14,264, dated October 28,18Sl, and in Germany, No. 33,386, dated May 20, 1885;) and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specification.

The object of my invention is to provide suitable apparatus forpracticing a process of purification of cast iron, described in anotherapplication Serial No. 322,200 for Letters Patent filed herewith, saidprocess involving the treatmentat ahigh temperature,with the aid ofcarbonaceous fuel and a hot blast, of pig iron with or Without theaddition of wrought iron scrap, in a neutral medium resulting from thecombined action of hot blast, fuel, pig-iron and iron ore in convenientproportions and in the presence of an extra-basic containing but littleiron-oxide slag, consisting mainly of lime and fluorspar.

Myinvention consists in a special construction of a cupola furnace,which is fully represented in the accompanying drawings, in which Figure1 is a vertical section on the line 03-00 of Fig. 2. Fig. 2 is a frontelevation partly in section on the line g of Fig. 1. Fig. 3 is anenlarged vertical section similar to Fig. 1, showing the details of theslag outlet and metal trough.

Like symbols of reference indicate like parts in each figure.

In the drawings, A is the cupola, the general construction of which isafter the usual pattern.

B indicates the position of the elevated stage from which the charge isintroduced into the opening G.

O is the chimney supported on four or more columns 0 c c, &c.

H is an annular perforated water pipe, surrounding the en pola at apoint above the zone of greatest heat, the purpose of which is toprevent the burning of the sheet metal exterior casing of the furnace.The water which is not evaporated is caught and carried away by anannular gutter I at the base of the eupola.

F F F are tuyeres for the introduction of hot blast in the usual way,and are watercooled by the ordinary devices for that purose. Thesetuyeres are located above the hearth of the furnace in three or moreseparate tiers, and with any suitable number in each tier as isusual,but their arrangement is peculiar in that the tiers are placed ata greater vertical distance apart than in the ordinary practice, thepurpose of which is to extend the depth of the zone of greatest heat onaccount of the larger proportion of lime and fluorspar to the ton ofmetal, which is used in my process, so as more eifectually to fuse andbring into contact these ingredients which are designed to react 011each other, and on the metal under treatment; and another peculiarity ofarrangement is that the tuyeres composing the lowest tier have adistinct dip or downward inclination the purpose of which is to prolongthe action of the blast on the iron, slag and fuel, until the iron whichhas been fused and refined together with its slag has been removedfromthe furnace. This arrangement also avoids too high a carburization ofthe iron, which otherwise might result from the high temperatureemployed and the extra basic nature of the slag. The cupola itself islined in the zone of greatest heat with a thin coating of usualrefractory material, which wears away very little, if at all. But aftertwenty or thirty hours running, this zone becomes coated with a liningof metallic iron, obviating the necessity of having that portion of thefurnace lined with basic material, the nature of the first coating beingthus of no further consequence.

In front of the furnace, at a lower level than the bottom of the hearthof the furnace, is a detached fore -hearth D, constructed of or linedwith refractory material. This forehearth may be heated in anyconvenient manner, and is designed to receive and store up the meltedmetal, which. may from time to time be tapped from it. A trough Econnects the hearth of the cupola with the fore-hearth, as will bepresently described. At the bottom of the hearth of the furnace andbelow the lowest tier of tuyeres, is the tap-hole K, forming a commonexit for the metal and slag, which pass off substantially at the sametime, the slag floating on the surface of the metal. Thence the metalfree from slag passing by the aperture L ascends in the conduit E, alongwhich it runs into the fore-hearth D. The shape of the passage-way forthe metal through the conduit E where it connects with the furnace isshown in Fig. 2. This conduit projecting from the body of the furnace islined with refractory material, and water-cooled on the outside by pipesR. Above the level at which the metal runs off is a passage 0 leadingoff the slag over the dam M outward to the slag trough as shown in Figs.1 and 3. This dam M is built up of brick cemented with coal tar. Aroundthe opening 0, through which the slag discharges, is coiled a pipe Q,through which a current of cold water, from any suitable source,constantly flows. At any suitable point the connections by which thiscoil is supplied may be flexible, to admit'of slight verticaladjustmentrof the, coil in the slag-opening, so that when desirable, thelevel at which the slag discharges may be varied. This is merely amatter of convenience, and not a part of the invention. The dam M issupported by a movable plate P, which is drawn aside when the dam has tobe removed, for putting the cupola out of work. The purpose of all thesearrangements is to separate the metal from the slag as soon as itreaches the bottom of the furnace and gets beyond the reach of theblast. The refined metal flows on one side by a steady continuous run tothe fore-hearth D, and the slag flows on the other side, through thehole left inwardly by the coil of the water pipe, in the slag trough.The tapping of the separate forehearth D does not interfere at all withthe run of the apparatus, and the continuation of the process, whichconsists of the melting of the pig-iron with or without scrap, itspassage through a highly heated neutral medium, resulting fromconvenient proportions of reducing material like fuel and pig and ofoxidizing materials like blast and iron ore, if necesrary, in presenceof a highly basic slag, composed of lime and fluorspar or equivalentsubstances, with which the silicon, sulphur and phosphorus unite bychemical reaction resulting in the purification of the metal.

I claim as my invention:

1. An apparatus for refining and purifying melted pig metal, consistingof asubstantially cylindrical receptacle with two or more rows oftuyeres located above the hearth, the lowest row of tuyeres having a dipor inclination inward and downward, while the tuyeres of the other rowsare substantially horizontal, and a tap-hole arranged to keep the levelof the molten metal below the tuyeres; substantially as and for thepurposes described.

2. A cupola furnace, provided with two or more rows of tuyeres locatedabove the hearth, the lowest row of tuyeres being inclined inwardly anddownwardly, and a single tap hole arranged to keep the level of themolten metal below the tuyeres;substantially as and for the purposesdescribed.

In testimony whereof I affix my signature in presence of two witnesses.

ANTOINE PIERRE GUILLAUME ROLLE'I.

Witnesses:

G. DE MEsTRAL, R. J. PREsToN.

